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A154037 Number of planar triangular n X n X n nonnegative integer grids symmetric under 120 degree rotation with every similarly oriented 3 X 3 X 3 subtriangle summing to 4. +0
1
0, 14, 8, 0, 29, 0, 0, 33, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0 (list; graph; listen)
OFFSET

3,2

COMMENT

Pattern 0 0 27 starts at n=11 and continues through at least n=60.

EXAMPLE

Maximal zeros solution for n=13

..............0

.............0.2

............2.0.0

...........0.0.2.0

..........0.2.0.0.2

.........2.0.0.2.0.0

........0.0.2.0.0.2.0

.......0.2.0.0.2.0.0.2

......2.0.0.2.0.0.2.0.0

.....0.0.2.0.0.2.0.0.2.0

....0.2.0.0.2.0.0.2.0.0.2

...2.0.0.2.0.0.2.0.0.2.0.0

..0.0.2.0.0.2.0.0.2.0.0.2.0

CROSSREFS

Sequence in context: A135638 A040185 A033964 this_sequence A119871 A010237 A035418

Adjacent sequences: A154034 A154035 A154036 this_sequence A154038 A154039 A154040

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Jan 04 2009

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Last modified December 19 12:50 EST 2009. Contains 171053 sequences.


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